JPH0316121Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a magnetic disk positioning device that can accurately position a magnetic disk at a predetermined position in a magnetic disk player having magnetic recording and/or reproducing functions. Regarding.

[Conventional technology]

2. Description of the Related Art Recently, a magnetic disk player has been proposed that records and/or reproduces still image information on a sheet-like magnetic disk (hereinafter referred to as a rotating magnetic sheet).

As this rotating magnetic sheet,
The one shown in FIG. 3 disclosed in No. 195674 has been proposed.

That is, this rotating magnetic sheet receives and holds the drive shaft of the magnetic recording/reproducing device at the rotational center of a disk-shaped magnetic sheet 2 housed in a magnetic sheet jacket 1 having a rectangular envelope-shaped window 9. A reinforcing member (center core) 5 having a metal plate 3 is attached, and a positioning surface 7 for aligning the center of rotation of the magnetic sheet 2 with the drive shaft is inserted into the insertion hole 6 formed in the center core 5 for inserting the drive shaft. , an elastic part 8 that elastically presses the drive shaft against the positioning surface 7.
and are integrally molded from a resin material.

In addition, as a magnetic disk player,
4 to 7 disclosed in specification No. 58-163258
What is proposed is shown in the figure.

FIG. 4 is a perspective view showing the internal structure of the magnetic disk player, and shows a state in which a jacket containing a rotating magnetic sheet is loaded into a jacket holder. This magnetic disk player has only a magnetic recording function and is configured to record still image information on a rotating magnetic sheet.

A jacket holder 14 in which a jacket 1 in which a rotating magnetic sheet 2 is rotatably housed can be inserted into and removed from a substrate 11 constituting the main body of the magnetic disk player is hinged at one end so that it can be moved up and down with respect to the substrate 11. It is rotatably attached via 15. Also, on the board 11, there is a case cover serving as a lid, that is, a part mounting plate 1 for attaching a part (not shown) that presses the magnetic sheet from the back side.
6 is rotatably attached via a hinge 15 so that it can be raised and lowered relative to the base plate 11 with a jacket holder 14 therebetween.

Note that when the jacket is loaded, the part mounting plate 16 is resiliently supported by the holder 14 via a spring member (not shown), and the holder 1
4 receives a spring force when pushing down the part mounting plate 16 toward the base plate 11, and rotates it together with the part mounting plate 16 in the direction of arrow A in FIG.
Conversely, when the part mounting plate 16 is pulled up from the board 11 side, the holder 14 engages with a locking part (not shown) provided on the part mounting plate 16, and is raised and separated from the board 11 together with the part mounting plate 16. It's summery.

A window portion 9 is formed in a portion of the jacket 1 so that a portion of the magnetic recording surface of the magnetic sheet 2 is exposed to the outside. One or more (one in this embodiment) magnetic head 18 provided on the substrate 11 side is inserted into the window 9.
Magnetic recording is performed on the magnetic sheet 2. Further, a center core 5 made of synthetic resin is provided at the center of rotation of the magnetic sheet 2 so as to face outside through a hole provided in the center of the jacket 1. A shaft insertion hole 6 is provided approximately at the center of the center core 5, and is provided upright on the substrate 11, into which a center spindle 21, which serves as a rotational drive shaft for the magnetic sheet 2, is inserted. An elastic portion 8 is integrally formed in this insertion hole 6 to prevent eccentricity between the center spindle 21 and the magnetic sheet 2.
By fitting the magnetic sheet 2 into the insertion hole 6, the center of the magnetic sheet 2 and the axis of the center spindle 21 can be aligned. Note that the center core 5 is provided with an annular metal plate 3, which will be described later.

Further, the magnetic sheet 2 is fitted onto the substrate 11, and a center spindle 21 serving as the center of rotation of the sheet 2 is provided, and the center core 5 of the magnetic sheet 2 is mounted on the substrate 11, which is rotatable around the spindle 21. a rotary table 25, a magnetic head 18 for recording still image information, etc. on the magnetic sheet 2 in the jacket 1, and a guide for stabilizing the state of contact of the magnetic head 18 with the magnetic sheet 2. A head moving operation unit 28 consisting of a plate 26, a moving arm 27 for automatically and intermittently feeding the magnetic head 18 in the radial direction of the magnetic sheet 2, and the like, and a drive for rotationally driving the rotary table 25 and the like. A motor 29 etc. are provided.

The magnetic head 18 is attached to the middle part of the moving arm 27, and the magnetic sheet 2 is attached to the center spindle 21, which is provided so as to face upward through the window for protruding the head formed in the guide plate 26.
The jacket 1 is brought into contact with the jacket 1 through the window 9. A magnetic sheet 2 is placed on the rotating table 25.
An annular permanent magnet 30 serves as an adsorption member for adsorbing an annular metal plate 3 integrally attached to one end surface of the center core 5 in order to place and fix the center core 5 on a rotary table 25. It is buried.

By the way, the jacket 1 loaded in the jacket holder 14 is attached to the part mounting plate 16.
When mounting the center core 5 on the center spindle 21 by pushing it down toward the board 11 by rotating it in the downward direction (direction of arrow A in FIG. 1), the center core 5
A center core pressing mechanism 31 for pressing the rotary table 25 onto the rotary table 25 is disposed.

This center core pressing mechanism 31 is a mechanism for pushing the magnetic sheet 2 to a proper position on the center spindle 21. That is, when the rotating magnetic sheet 2 is fitted onto the center spindle 21 by this mechanism, due to the sliding friction force between them,
The center core 5 will stop in the middle of the center spindle 21, and the rotating magnetic sheet 2 will be rotated while the rotating magnetic sheet 2 is not fully loaded into the main body of the magnetic disk player. This is to prevent leakage, etc.

As shown in FIG. 5, this pressing mechanism 31 includes a support piece 32 that is formed to hang down from the back side of the part mounting plate 16, and a toggle lever 33 that is swingably supported at the tip of this support piece 32. It becomes true. Also,
A compression coil spring 34 is attached to the back of the parts mounting plate 16.
A piece member 35 is provided which engages with one end of the toggle lever 33 via the lever and holds the lever 33.
Under normal conditions, the toggle lever 33 is held by a piece member 35 such that the other end thereof protrudes toward the substrate 11 (downward in FIG. 5). A core pressing piece 36 is pivotably supported at the other end of the toggle lever 33. The piece member 35 is a center core that automatically releases the pressing of the center core 5 by the core pressing piece 36 when the part mounting plate 16 is rotated together with the holder 14 and pressing of the center core 5 by the core pressing piece 36 is completed. It is also a component of the pressure release mechanism 37.

Next, the functions of the pressing mechanism 31 and the pressing mechanism 37 will be explained.

With the jacket 1 loaded in the jacket holder 14, the part mounting plate 16 is pushed down toward the board 11. By pushing down the part mounting plate 16, the part mounting plate 16 and the holder 14 are moved to the fourth position around the hinge 15.
The parts mounting plate 16 and the holder 14 are rotated in the direction of the arrow A in the figure, and the parts mounting plate 16 and the holder 14 are lowered toward the board 11. As the holder 14 is lowered, the center core 5 of the rotating magnetic sheet 2 in the jacket 1 loaded in the holder 14 is attached to the center spindle 21.

The spindle 21 is inserted into the shaft insertion hole 6 of the center core 5.
When the center core 5 is inserted into the spindle 21, a sliding friction force is generated between the shaft insertion hole 6 and the spindle 21 due to the elastic force of the pressing piece 8, which is an elastic part. 4. Rotation in the direction of arrow A in Figure 4 stops and the parts mounting plate 16
Only the arrow A in Fig. 4 resists the spring force of the spring member.
It will rotate in the direction.

When the push-down operation of the part mounting plate 16 is further continued in this state, the core pressing piece 36 of the toggle lever 33 comes into contact with the center core 5, as shown in FIG. 5, and the core 5 is pressed by the spring force of the toggle.

Then, the core 5 is pushed in until it is placed on the rotary table 25.

When the part mounting plate 16 is pushed down to a certain point, one end of the toggle lever 33
5 against the spring force of the compression coil spring 34 while sliding on the top member 35, toggle lever 3
3 is in a reversed state in the clockwise direction in FIG.

By reversing the toggle lever 33, the core pressing piece 36
The pressing action of the center core 5 due to this is released. Note that since the core 5 is pushed in by the core pressing piece 36 until it is placed on the rotary table 25, even if the toggle lever 33 is reversed, the core 5 is not moved by the permanent magnet 30 provided on the rotary table 25. It is now in a state where it is firmly adsorbed. By attaching the core 5 to the center spindle 21 in this manner, the rotating magnetic sheet 2 can be accurately positioned at a predetermined position on the substrate 11. Therefore, stable rotation of the magnetic sheet 2 can be obtained, and still image information can be accurately recorded.

In addition, since the center core 5 can be securely placed and fixed on the rotary table 25, the position detection coil (PG coil) of the rotating magnetic sheet 2 placed close to the core 5 will not touch the core 5. It is possible to obtain stable rotation of the seat 2 without any problems.

Note that when the part mounting plate 16 is raised in order to take out the jacket 1 from the jacket holder 14, the core pressing piece 36 of the toggle lever 33 comes into contact with the stopper piece 38 fixed to the holder 14, as shown by the dashed line. The movement of the toggle lever 33 is regulated, and one end of the toggle lever 33 slides on the top member 35 against the spring force of the compression coil spring 34, rotating counterclockwise in FIG. Return to the original position.

In addition, as other conventional examples, Fig. 6A and Fig. 6B
There is something shown below. This means that the other end of the toggle lever 33 constituting the center core pressing mechanism 31 is the sixth
As shown in FIG. A, the core pressing piece 36 is formed into a downwardly bent shape, and a core pressing piece 36 is swingably supported at the tip thereof. A pair of stopper pieces 43, 43 constituting the center core press release mechanism 37 are fixed to the holder 14 so as to be opposed to each other with the other end of the toggle lever 33 placed therebetween.

That is, when the spindle 21 is inserted into the shaft insertion hole 6 of the center core 5, a sliding friction force is generated between the shaft insertion hole 6 and the spindle 21 due to the elastic force of the pressing piece 8, and the center core 5 is inserted into the spindle 21. When a load is applied to the part mounting plate 16, the rotation of the jacket holder 14 in the direction of arrow A in FIG.
Only the spring member rotates in the direction of arrow A in FIG. 4 against the spring force of the spring member.

When the push-down operation of the part attachment plate 16 is further continued in this state, the core pressing piece 36 of the toggle lever 33 presses the core 5 by the spring force of the toggle.

When the core 5 is pushed in until it is placed on the rotary table 25, the bent portion of the toggle lever 33 comes into contact with the stopper piece 43. If you continue to push down the part mounting plate 16 in this state, the toggle lever 33 will be forcibly rotated in the clockwise direction.
The core pressing piece 36 is separated from the center core 5, and the pressing of the center core 5 is released.

In this way, even in the conventional example described above, the center core 5 is pressed against the rotary table 2 by the core pressing piece 36.
Since the core 5 is pushed in until it is placed on the permanent magnet 30, the core 5 can be attracted and held by the permanent magnet 30.

Further, since the pressed state of the center core 5 can be forcibly released after the center core 5 is pressed onto the rotary table 25 by the core pressing piece 36 of the toggle lever 33, the pressing of the center core 5 can be reliably released. I can do it.

Still another conventional example will be explained with reference to FIGS. 7A and 7B.

In this conventional example, the center core 5 is pressed by a leaf spring 60.

As shown in FIG. 7A, a plate spring 60 constituting the center core pressing mechanism 31 is fixedly attached to the back surface of the part mounting plate 16. This leaf spring 60
The free end side is bent toward the back side of the part mounting plate 16 to form a core pressing piece 62. leaf spring 60
is normally received and supported by a spring charge piece 63 fixed to the part mounting plate 16. Further, a stopper piece 65 constituting a center core pressure release mechanism 31 for releasing the pressure on the center core 5 by the leaf spring 60 is fixed to the jacket holder 14.

That is, when the spindle 21 is fitted into the shaft insertion hole 6 of the center core 5, a sliding friction force is generated between the shaft insertion hole 6 and the spindle 21 due to the elastic force of the pressing piece 8, and the center core 5 is inserted into the spindle 21. When a load is applied to the jacket holder 14, the fourth
The rotation in the direction of arrow A in the figure is stopped, and only the part mounting plate 16 rotates in the direction of arrow A in FIG. 4 against the spring force of the spring member.

When the pressing operation of the part attachment plate 16 is further continued in this state, the core pressing piece 62 of the leaf spring 60 comes into contact with the center core 5 and elastically presses the center core 5.

When the core 5 is pushed in until it is placed on the rotary table 25, the midway part of the leaf spring 60 comes into contact with the stopper piece 65, and the core pressing piece 62 presses the center core 5 as shown in FIG. 7B. The center core 5 is released from the press.

In this way, even in the embodiment, the center core 5 is pushed by the core pressing piece 62 until it is placed on the rotary table 25, so that the core 5 is reliably attracted and held by the permanent magnet 30. can do.

[Problem that the invention attempts to solve]

In the conventional magnetic disk positioning device configured as described above, the center core pressing mechanism 31 and the pressing release mechanism 37 have many parts, as in the conventional example shown in FIG. 5 or FIG. There were problems in that a complicated mechanism had to be used and it was difficult to miniaturize.

Furthermore, in the conventional example shown in FIGS. 7A and 7B, the core pressing piece 62 is integrally formed at the free end of a single leaf spring 60, so that the center core 5 cannot be fitted onto the spindle 21. When inserting one protrusion 6
There was a problem in that only the center core 7 strongly abuts one side of the center core 5, causing a malfunction in which the center core 5 is inserted into the spindle 21 obliquely.

In view of the above-mentioned points, it is an object of the present invention to provide a magnetic disk positioning device having a simple mechanism with a small number of parts for reliably and accurately fitting a center core into a spindle.

[Means for solving problems]

The magnetic disk positioning device of the present invention has an elastic portion 8 provided in the insertion hole 6 portion of the center core 5 of the rotating magnetic sheet 2, which is a recording medium installed in a magnetic disk player. In a magnetic disk positioning device for a magnetic disk player for inserting the magnetic disk into a rotating drive spindle 21 of the player against resistance, a first spring 72 and a second spring 73 are installed on the player's part mounting plate 16, The end portion is configured to be able to elastically abut against the side surface of the center core 5, and the jacket holder 1 of the magnetic disk player
A push-up stand 81 is installed on the first spring 72 and the second spring 73 when the player parts mounting plate 16 is closed.
The spring 72 and the second spring 73 are characterized in that their respective free ends are spaced apart from the center core 5.

[Effect]

As a result, the center core 5 of the rotating magnetic sheet 2
is evenly pressed against the spindle 21 by a pair of first springs 72 and second springs 73 to insert it into the proper state, and to mount the rotating magnetic sheet 2 at the proper position in the magnetic disk player.

〔Example〕

Hereinafter, one embodiment of the magnetic disk positioning device of the present invention will be described with reference to FIGS. 1A, B, and C and FIG. 2. Note that in FIGS. 1A, B, and C and FIG. 2, parts corresponding to those in FIGS. 3 to 7 are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

1A, B, and C are longitudinal sectional side views showing the main parts of the magnetic disk positioning device of this example, in which a pressing spring body 70 is installed on the back side of the part mounting plate 16.

As shown in the exploded perspective view of FIG. 2, this spring body 70 is composed of a cover surface attachment part 71, a short spring part 72 which is a first spring, and a long spring part 73 which is a second spring.

This cover surface mounting portion 71 is formed into a rectangular flat plate shape, and three through holes 74 for fixing pins are bored at predetermined positions.

A pair of short spring portions 72 and a long spring portion 73 are formed integrally by being bent downward at a predetermined angle from the cover surface attachment portion 71, separated by a slit 75.
This short spring part 72 is a long trapezoidal elastic plate piece, and its free end has an engaging corner part 76 formed by bending downward into a hook shape, and a pressing end protruding from this in an L-shape. It consists of part 77.

Furthermore, a pressing protrusion 78a formed in a horizontal groove having a U-shaped cross section and projecting downward is provided on the pressing end 77.

The long spring part 73 is a long trapezoidal elastic plate that is longer than the short spring part 72, and its free end is bent into an L shape, so that the free end is an extension of the pressing end 77 of the short spring part 72. Make sure it is on the line.

In order to align the height position also at the free end of the long spring part 73, the engaging corner part 7 is bent into a hook shape.
6, and a pressing end 7 protruding from this in an L-shape.
7, and this pressing end 77 has a cross section U.
A pressing protrusion 78b, which is a letter-shaped horizontal groove, is provided in a protruding manner.

The pressing protrusion 78a of the short spring part 72 and the pressing protrusion 78b of the long spring part 73 are arranged so as to sandwich the shaft insertion hole 6 of the center core 5.
It is configured to be placed at a predetermined distance such that it touches the circumference. The bent portion of the long spring portion 73 with the surface mounting portion 71 has a bending angle greater than that of the short spring portion 72 so that the bending moment at its free end is balanced with that of the short spring portion 72.

In addition, a short spring portion 72 is attached to a part of the jacket holder 14 between the part mounting plate 16 and the board 11.
An engaging portion 80 is formed which engages with the engaging corner portion 76 of and receives the urging force.

Note that the engagement corner 76 of the short spring section 72 engages with the engagement portion 80 of the jacket holder 14, and urges the part mounting plate 16 and the jacket holder 14 apart from each other. The necessary spring component at the hinge 15 between the two can be omitted.

Further, at predetermined positions near the engaging portion 80 of the jacket holder 14, there are push-up platforms 81 for pushing up the short spring portion 72 and the long spring portion 73 (not shown), respectively.
to protrude.

In addition, in this example, although the short spring part 72 and the long spring part 73 were integrally configured in the single spring body 70, the short spring part 72 and the long spring part 73
Of course, they may be constructed as separate parts and installed separately on the back surface of the part mounting plate 16.

Next, the operation of this example device configured as described above will be explained.

First, from the state shown in FIG. 1A, the center core 5
When the spindle 21 is inserted into the shaft insertion hole 6 of the center core 5, a sliding friction force is generated between the shaft insertion hole 6 and the spindle 21 due to the elastic force of the pressing piece 8, and a load is applied to the insertion of the center core 5 into the spindle 21. The rotation of the jacket holder 14 in the direction of arrow A in FIG. 4 is stopped, and only the part mounting plate 16 continues to rotate against the biasing force of the short spring portion 72, resulting in the state shown in FIG. 1B.

If the push-down operation of the part mounting plate 16 is further continued in this state, the pressing protrusions 78 of each short spring part 72
a and the pressing protrusion 78b of the long spring portion 73 press the core 5 evenly and into the spindle 21 by mutually independent biasing actions without hitting only one side.
This prevents the core 5 from being inserted into the spindle 21 obliquely due to a portion of the core 5 being strongly pressed by one of the pressing protrusions.

In addition, since each of the pressing protrusions 78a and 78b is shaped like a protrusion with a certain length, the core 5
When pressed against the plane around the shaft insertion hole 6,
This prevents the core 5 from tilting in the longitudinal direction of the pressing protrusions 78a, 78b.

Next, when the core 5 is pushed in until it is placed on the rotary table 25, the short spring portion 7 as shown in FIG.
2 and 2 abut on each push-up stand 81, respectively. When the part mounting plate 16 is further pushed down in this state, the short spring portion 72 and the long spring portion 73 are forcibly rotated in the clockwise direction in the figure, and the respective pressing protrusions 78a and 78b are separated from the center core 5. Then, the pressure on the center core 5 is released, the rotating magnetic sheet is installed inside the magnetic disk player, and the case cover 16 is closed, which is the operating state.

In this way, according to the device of this example, the center core 5 is pushed in by the spring body 70 having a pair of short spring parts 72 and a long spring part 73 until it is placed at an appropriate position on the rotary table 25. Therefore, the core 5 can be reliably attracted and held by the permanent magnet 30, and the rotating magnetic sheet 2 can be accurately positioned at a predetermined position on the substrate 11. Therefore, stable rotation of the magnetic sheet 2 can be obtained, and still image information can be accurately recorded. Note that the configurations, functions, and effects other than those detailed above are the same as those shown in FIGS. 3 to 7.

[Effect of idea]

According to the magnetic disk positioning device of the present invention,
The short spring part and the long spring part actuate independently of each other, allowing the center core to be inserted into the spindle reliably and accurately.The structure is simple, and the number of parts is reduced, making it inexpensive. The present invention has the advantage that it is possible to provide a product and also to make it smaller and thinner.

[Brief explanation of the drawing]

Figures 1A, B, and C are longitudinal sectional views showing one embodiment of the magnetic disk positioning device of the present invention, Figure 2 is an exploded perspective view of its main parts, and Figure 3 is an example of a conventional rotating magnetic sheet. The plan views shown in FIGS. 4 to 7 are explanatory diagrams illustrating the structure of a conventional magnetic disk player. 1 is a magnetic sheet jacket, 5 is a center core, 70 is a pressing spring body, 72 is a short spring portion, 73 is a long spring portion, 80 is an engaging portion, and 81 is a push-up table.

Claims (1)

[Claims for Utility Model Registration] The insertion hole of the rotating magnetic sheet, which has an elastic part provided in the insertion hole of the center core, is inserted into the rotational drive spindle against the elasticity of the elastic part. In a magnetic disk positioning device, a first spring and a second spring are provided on a part mounting plate of a magnetic disk player so that each free end can come into contact with a side surface of the center core, and a first spring and a second spring are installed on a jacket holder of the magnetic disk player. and a push-up stand that faces the first spring and the second spring, respectively, and separates the free end portions of the first spring and the second spring from the center core when the part mounting plate is in a closed state of use. , so that when the insertion hole is inserted into the spindle, the respective free ends of the first spring and the second spring can come into contact with and press the center core so as to sandwich the insertion hole of the center core. Magnetic disk positioning device configured at a distance.